Part time working under the new agreement

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Good Evening!

Please can someone, possibly who works in the trial offices, help me understand the working hours for part timers (30 Hours) under the new pattern.
Myself and another staff member currently do 4 days a week, full time days. In the published Q&A the union say that we are able to continue to do a 4 day week? Our office seems likely to choose a two Saturdays off in 5 weeks rota where the rounds look like they will be in groups of 4. Even the rurals also, so will it be like a day off cover for this?

Many thanks in advance for any help here